I don't own Batman TAS characters.
''What do we have in common? We enjoy forms of mind control. Causing chaos,'' the Mad Hatter said to the Scarecrow. He glanced at various people he mentally controlled while they wandered the streets. He turned to others shrieking due to the Scarecrow's fear toxins. The Mad Hatter and the Scarecrow gasped when Batman, their common enemy, appeared and before he defeated them. Cops arrested them.
After the Scarecrow and the Mad Hatter were sent to Arkham Asylum, they found something they didn't have in common. The Scarecrow viewed horror films. The Mad Hatter loved Alice in Wonderland. They scowled.
THE END